x(x-1)+2x(x+1)
=x²-x+2x²+2x
=3x²+x
-3x(2x-5)
=-6x²+15x
(2x+1)(x+3)
=2x²+7x+3
(m+2n)(m-3n)
=m²-mn-6n²
(2x^2-1)(x-4)
=2x³-8x²-x+4
在右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.
x(x-1)+2x(x+1)
=x²-x+2x²+2x
=3x²+x
-3x(2x-5)
=-6x²+15x
(2x+1)(x+3)
=2x²+7x+3
(m+2n)(m-3n)
=m²-mn-6n²
(2x^2-1)(x-4)
=2x³-8x²-x+4
在右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.